Installation Instructions User guide

Bul. 937C Universal Frequency Converter Installation Instructions

Start-up override

Activation of start-up override and its effect:

•You can activate start-up override with a signal to terminals 13/14 (at least 100 ms).

•Start-up override prevents switch outputs from signalling a limit violation during the configured override

period (start-up phase).

•Start-up override affects only those switch outputs with the MIN switching direction

(Refer to Limit switch). If a switch output has active as its mode of operation, it will remain de-

energized during the

override period. If its mode of operation is passive, it will be forced to remain

energized during the override period (on the mode of operation, Limit switch).

•The start-up override is edge triggered: before it can be triggered again, the signal must be turned off on

terminals 13/14 for at least 200 ms. If a signal interruption occurs and a new signal arrives during the

override period, the timer is restarted.

Pulse suppression:

Using the FDT

software (this is not possible with the control panel), you can alternatively select pulse

suppression instead of start-up override.

•If pulse suppression is selected, the universal frequency converter will ignore all incoming pulses, as long

as a signal is present on terminals 13/14. It then behaves for all evaluations as though the start value of the

measurement range is constantly applied.

•If pulse suppression has been selected, start-up override is deactivated. Restart inhibit is also not possible

(Refer to Restart inhibit).

If problems should occur with the start-up override, use the FDT software to check whether pulse

suppression may have been selected.